Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure
2006 Chevrolet HHR L4-2.2LSECTION Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure
INSPECTION/MAINTENANCE (I/M) HEATED OXYGEN SENSOR/OXYGEN SENSOR (HO2S/O2S) SYSTEM SET PROCEDURE
DESCRIPTION
The purpose of this test is to satisfy the enable criteria necessary to execute inspection and maintenance (I/M) readiness diagnostics for the oxygen sensor/heated oxygen sensor (O2S/HO2S) system. The test may be used to set the I/M System Status to YES. The I/M System Status Display on the scan tool provides an indication of whether the control module has completed the required tests. The I/M System Status does not indicate that the tests have passed or failed. When all of the diagnostics for a specific system have run and passed the I/M System Status will update to YES. If a test for a specific system has failed, the I/M System Status will update to YES, indicating a determination was made, even if all of the other tests for that system have not run.
CONDITIONS FOR RUNNING
- The fuel level is more than 10 percent.
- The engine speed is between 1,000-3,500 RPM.
- The short term FT is between -20 and +20 percent.
- The vehicle speed sensor (VSS) is between 32-121 km/h (20-80 mph).
- The engine coolant temperature (ECT) is more than 70°C (158°F).
- The engine is running in Closed Loop fuel control.
- The engine has been running for more than 200 seconds.
- The battery voltage is 11 volts.
DIAGNOSTIC AIDS
If the status does not update, the test outlined in this procedure can be repeated until the I/M System Status updates to YES.
If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in engine load, such as a cooling fan or an A/C compressor clutch turning ON, may cause the test to abort.
TEST
Step 1 - Step 5:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.